Both the organization chart and job description are simplified abstractions of the actual situation. In reality there are many more positions and relationships than indicated in the organization chart. It might happen that industrial cleaning might not clean all required things. The degree of authority a superior has over his subordinate is also not indicated in the chart, nor is the relationship between two managers at an equal level reflected in the organization chart.

Despite all these limitations, the organization chart is an extremely useful tool in understanding and designing the structure. The structure of an organization, unlike that of a physical mechanical or biological system, is not visible. Therefore, it can only be understood by a representative model and by observing its behaviour.